feat(admin): Owner column on All Users' Events card

Adds the event's wallet owner (user_id) as the first column of the
admin-only All Users' Events table so cross-tenant rows are
attributable at a glance. Server-side join: GET /events/all now
resolves each event.wallet -> wallet.user and stamps the result on
the response as wallet_user_id. Frontend gets a dedicated
allUsersEventsTable.columns definition so the user's own-events
table stays unchanged.

Follow-up #22 covers letting the admin actually edit those events
once attributed.

static/js/index.js

@@ -14,6 +14,51 @@ window.PageEvents = {
       settings: {
         auto_approve: false
       },
+      allUsersEventsTable: {
+        // Shown on the admin All Users' Events card. Includes the
+        // wallet owner (`wallet_user_id` resolved server-side) so
+        // cross-tenant rows are attributable to a user.
+        columns: [
+          {
+            name: 'wallet_user_id',
+            align: 'left',
+            label: 'Owner',
+            field: 'wallet_user_id'
+          },
+          {name: 'id', align: 'left', label: 'ID', field: 'id'},
+          {name: 'name', align: 'left', label: 'Name', field: 'name'},
+          {
+            name: 'event_start_date',
+            align: 'left',
+            label: 'Start date',
+            field: 'event_start_date'
+          },
+          {
+            name: 'event_end_date',
+            align: 'left',
+            label: 'End date',
+            field: 'event_end_date'
+          },
+          {
+            name: 'closing_date',
+            align: 'left',
+            label: 'Ticket close',
+            field: 'closing_date'
+          },
+          {
+            name: 'canceled',
+            align: 'left',
+            label: 'Canceled',
+            field: row => {
+              if (row.extra && row.extra.conditional && row.canceled) {
+                return 'Yes'
+              }
+              return 'No'
+            }
+          },
+          {name: 'status', align: 'left', label: 'Status', field: 'status'}
+        ]
+      },
       eventsTable: {
         columns: [
           {name: 'id', align: 'left', label: 'ID', field: 'id'},